Malicious PDF — malware analysis report

Static analysis result for SHA-256 438dc29f7a3c5f34…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 05:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47081a22b24b0fb0902423eaa1b8aa79 SHA-1: 631a82fe29e4efd18e3800bab96eb55b3995b145 SHA-256: 438dc29f7a3c5f34efa788e82b96495d7665c5d8423822eb8f0812cd7429ae26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aps-mes.com/files/file/kijut.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098646bbb61a---86972589563.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jalufiduziwidamemelabel.pdfIn PDF document text
    • https://avvocatoboretti.it/file/nupafopuxamaxegabunituwer.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b656204bd99---golukeseroberuxiw.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210606075933.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bc924c5d---jagenikomubevedizesiki.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea9ddfc9b---94595387988.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/44680413327.pdfIn PDF document text
    • https://lesura.net/userfiles/file/nanifisoxinivekem.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/kekof.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gonepim.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450ef4fc93---28766229362.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7f4fcee78b549446990834940c3e8615/79965980620.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6200b1565a820d7dfbd237501e5dea58/18690546667.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/6614180058.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/rozaxidamagafagezofonut.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c19a3ab0bd251fc79c93b213236b7749/18486514356.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0a2420f09e89701f021d3b70852ef440/kexifozulavunojemo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765484436ed---soxaxal.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/deguj.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2a0f6463548cd4dec86ee549a923448b/lodevuwutowidukitafowetem.pdfIn PDF document text
    • http://sinoorchids.com/image/file/dakasipitatupoj.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/nopapomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=united+states+constitution+pdf+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10760 bytes
SHA-256: 34ee407ffe6ca57c53616fbe2fd7d72a0c669a9c48a51386d858575fb92f7e82
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 18160 bytes
SHA-256: 8632e45bce324db1e64a5838ad68949e861f2b9bdd8fd4c3f60a339e0e471e5f

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